<template>
  <div class="about">
      <el-radio-group v-model="isCollapse" style="margin-bottom: 20px;">
          <el-radio-button :label="false">展开</el-radio-button>
          <el-radio-button :label="true">收起</el-radio-button>
      </el-radio-group>
      <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
          <el-submenu index="1">
              <template slot="title">
                  <i class="el-icon-location"></i>
                  <span slot="title">导航一</span>
              </template>
              <el-menu-item-group>
                  <span slot="title">分组一</span>
                  <el-menu-item index="1-1">选项1</el-menu-item>
                  <el-menu-item index="1-2">选项2</el-menu-item>
              </el-menu-item-group>
              <el-menu-item-group title="分组2">
                  <el-menu-item index="1-3">选项3</el-menu-item>
              </el-menu-item-group>
              <el-submenu index="1-4">
                  <span slot="title">选项4</span>
                  <el-menu-item index="1-4-1">选项1</el-menu-item>
              </el-submenu>
          </el-submenu>
          <el-menu-item index="2">
              <i class="el-icon-menu"></i>
              <span slot="title">导航二</span>
          </el-menu-item>
          <el-menu-item index="3" disabled>
              <i class="el-icon-document"></i>
              <span slot="title">导航三</span>
          </el-menu-item>
          <el-menu-item index="4">
              <i class="el-icon-setting"></i>
              <span slot="title">导航四</span>
          </el-menu-item>
      </el-menu>
  </div>
</template>
<style>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
}
</style>

<script>
export default {
    data() {
        return {
            isCollapse: true
        };
    },
    methods: {
        handleOpen(key, keyPath) {
            console.log(key, keyPath);
        },
        handleClose(key, keyPath) {
            console.log(key, keyPath);
        }
    }
}
</script>